Android: fixed bug in Java code that caused compiler errors on API Level 21.

modules/juce_core/native/java/AndroidRuntimePermissions.java

@@ -1,5 +1,3 @@
-    private native void androidRuntimePermissionsCallback (boolean permissionWasGranted, long ptrToCallback);
-
     @Override
     public void onRequestPermissionsResult (int permissionID, String permissions[], int[] grantResults)
     {

modules/juce_core/native/java/JuceAppActivity.java

@@ -136,6 +136,8 @@ public class JuceAppActivity   extends Activity
         }
     }
 
+    private native void androidRuntimePermissionsCallback (boolean permissionWasGranted, long ptrToCallback);
+
     $$JuceAndroidRuntimePermissionsCode$$ // If you get an error here, you need to re-save your project with the introjucer!
 
     //==============================================================================